Bafang error 36: Key detection circuit error
Bafang CAN systems (M400/M500/M600/M620, DP C18 CAN, 850C/860C CAN)Dealer neededDo not keep riding
The circuit that reads the ignition/key or power-button signal on CAN systems is faulty, so the controller cannot confirm the bike was switched on properly. The bike may not power up correctly or shows the code straight away.
Likely causes
- Fault in the display's power-button circuit
- Damaged wire on the key/ignition line in the harness
- Water in the display or harness connector
- Controller input damaged
How to fix Bafang error 36
- Power cycle; hold the power button firmly for 2-3 seconds
- Inspect the display and harness connectors for water and bent pins
- Try a known-good display if available
- Replace the harness or display; if unchanged, the controller needs replacing
Go to a dealer if: Go to a shop if a known-good display does not clear the code.
Warranty: If the bike or kit is under warranty (usually 1-2 years via the seller), contact them before opening anything, as opened motors and controllers can void the claim.
Typical cost: Display EUR/USD 60-200; controller EUR/USD 100-300.
Warranty: If the bike or kit is under warranty (usually 1-2 years via the seller), contact them before opening anything, as opened motors and controllers can void the claim.
Typical cost: Display EUR/USD 60-200; controller EUR/USD 100-300.
Still stuck? Take a photo of the display and show it to a local e-bike workshop. Bring the bike's system name (e.g. Bosch Performance Line CX) and the exact code; that saves diagnostic time and money.
Frequently asked
Can I reset error 36?
A power cycle helps only if a connector was loose.
Can I keep riding?
Usually the system will not enable assist. Pedal home.
Warranty?
Yes as a component defect.
Related Bafang codes
Not an official Bafang document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.